package day02;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

/**
 * Created by MGL on 2017/4/11.
 */
public class Test01 {
    public static void main(String[] args) {
        Map map = new HashMap();
        map.put("1", null);
        map.containsKey();
        map.containsValue();
        Hashtable table = new Hashtable();
        table.put(null, 1);
        table.contains();
        table.containsKey();
        table.containsValue(1);
    }
}
